So the only thing in common is WD disks. I don't know at this point.. NCQ withWD disks (at least raptor150s/300s) is completely broken and I have to disableit to use the disks without NCQ errors and dropping out of arrays (on 3 diff)systems with different chipsets, p35, 965.

This guy has the same errors I do when I enable NCQ. It seems like WD raptorsshould be blacklisted from using NCQ in the kernel.

How much time have you spent replacing and RMA'ing disks? Personally for meI spent $3600 on new velociraptors but after having spend hours, days withdoing testing, replacing, I have spent much more in time than the drives areworth. I am really getting sick and tired of it, every few days or every weekits another drive failure (or more). What are you plans, just keep RMA'ing and hopefully they'll find the bug and fix it or just give up and build a new system for production and the RMA'ing can be a hobby in another system?

What I meant when I asked did you buy them new, was, did you buy them recently,because with the raptor150s I have in another system, all 1+ year old, boughtnew but I wonder if they changed something in their firmware to cause thisproblem, when I opened a case with WD about the issue and spoke with someonein India they are only setup to answer basic questions and anything complicatedyou will get canned answer: "RMA."

Time to dump WD raptor drives?

I will note I am using several 750GiB drives without any issue whetherNCQ is enabled or disabled in various raid and non-raid configurations.